KR102109934B1 - Photographing lens and photographing device - Google Patents

Abstract

Disclosed is an imaging lens and an imaging device having the same.
The disclosed photographing lens includes: a first lens having a convex surface on the object side and having a positive refractive power; A second lens having negative refractive power having a convex surface on the image side; A third lens having a meniscus shape having a concave surface on the image side and having a positive refractive power; A fourth lens having a meniscus shape having a convex surface on the image side and having a positive refractive power; And a fifth lens having a concave surface on the image side near the optical axis and having negative refractive power.

Description

A photographing lens and photographing device having the same

An embodiment of the present invention relates to a small photographing lens and a photographing apparatus including the same.

BACKGROUND ART A photographing apparatus using a solid-state imaging device such as a CCD (Charge Coupled Devices) type image sensor or a Complementary Metal-Oxide Semiconductor (CMOS) type image sensor is widely used. Such photographing devices include digital still cameras, video cameras, and interchangeable lens cameras. In addition, since an imaging device using a solid-state imaging element is suitable for miniaturization, it has recently been applied to small information terminals such as mobile phones. Users have demands for high performance such as high resolution and wide angle. In addition, consumer expertise in cameras continues to rise.

The miniaturization and high pixelation of the imaging device are progressing, and accordingly, high resolution and high performance of the imaging lens are required. However, although a bright lens having an F number of 2.8 or higher was also implemented, it is difficult to obtain sufficient optical performance due to the effect of diffraction in the case of a bright lens.

An embodiment of the present invention provides a photographing lens that is compact and has high imaging performance.

An embodiment of the present invention provides a photographing apparatus including a photographing lens that is compact and has high imaging performance.

The photographing lens of the present invention, which is arranged in order from the object side to the image side, has a convex surface on the object side, a first lens having a positive refractive power; A second lens having negative refractive power having a convex surface on the image side; A third lens having a meniscus shape having a concave surface on the image side and having a positive refractive power; A fourth lens having a meniscus shape having a convex surface on the image side and having a positive refractive power; And a fifth lens having a concave surface on the image side near the optical axis and having negative refractive power.

<Expression>

-3.0 <(r21 + r22) / (r21-r22) <-1.0

-10.0 <(r31 + r32) / (r31-r32) <-1.5

Here, r21 is the paraxial curvature radius of the object-side surface of the second lens, r22 is the paraxial curvature radius of the image-side surface of the second lens, r31 is the paraxial curvature radius of the object-side surface of the third lens, r32 is the second 3 It is the paraxial curvature radius of the image side of the lens.

The first lens and the second lens satisfy the following equation.

<Expression>

0.75 <f1 / f <1.4

-2.0 <f2 / f <-0.7

Here, f is a focal length of the photographing lens, f1 is a focal length of the first lens, and f2 is a focal length of the second lens.

The third and fourth lenses satisfy the following equation.

<Expression>

1.2 <f3 / f <3.8

0.4 <f4 / f <1.0

Here, f represents a focal length of the photographing lens, f3 represents a focal length of the third lens, and f4 represents a focal length of the fourth lens.

The fifth lens satisfies the following equation.

<Expression>

-0.85 <f5 / f <-0.3

Here, f denotes a focal length of the photographing lens, and f5 denotes a focal length of the fifth lens.

The fifth lens has a biconcave shape near the optical axis.

The image side surface of the second lens does not have an inflection point.

The image side surface of the fifth lens has at least one inflection point in addition to the intersection point with the optical axis.

The first lens, the third lens, the fourth lens, and the fifth lens are formed of the same material.

The photographing lens satisfies the following equation.

<Expression>

νd1345> 50.0

Here, νd1345 denotes the Abbe number for the d-line of the first lens, the third lens, the fourth lens, and the fifth lens.

The photographing lens satisfies the following equation.

<Expression>

νd2 <25.0

Here, νd2 represents Abbe's number with respect to the d-line of the second lens.

The photographing lens satisfies the following equation.

<Expression>

D34t <D3t

Here, D34t represents the air gap on the optical axis of the third lens and the fourth lens, and D3t represents the optical axis thickness of the third lens.

The photographing lens satisfies the following equation.

<Expression>

1.0 <(r41 + r42) / (r41-r42) <3.0

Here, r41 represents the paraxial curvature radius of the object-side surface of the fourth lens, and r42 represents the paraxial curvature radius of the image-surface side of the fourth lens.

The photographing lens satisfies the following equation.

<Expression>

-0.8 <(r51 + r52) / (r51-r52) <3.0

Here, r51 represents the paraxial curvature radius of the object-side surface of the fifth lens, and r52 represents the paraxial curvature radius of the top surface-side surface of the fifth lens.

A photographing apparatus according to an embodiment of the present invention includes a photographing lens and a photographing element that receives an optical image formed by the photographing lens and converts it into an electrical image signal, wherein the photographing lens comprises:

A first lens arranged in order from the object side to the image side, having a convex surface on the object side, and having a positive refractive power; A second lens having negative refractive power having a convex surface on the image side; A third lens having a meniscus shape having a concave surface on the image side and having a positive refractive power; A fourth lens having a meniscus shape having a convex surface on the image side and having a positive refractive power; And a fifth lens having a concave surface on the image side near the optical axis and having negative refractive power.

<Expression>

-3.0 <(r21 + r22) / (r21-r22) <-1.0

-10.0 <(r31 + r32) / (r31-r32) <-1.5

Here, r21 is the paraxial curvature radius of the object-side surface of the second lens, r22 is the paraxial curvature radius of the image-side surface of the second lens, r31 is the paraxial curvature radius of the object-side surface of the third lens, r32 is the second 3 It is the paraxial curvature radius of the image side of the lens.

The imaging lens according to the embodiment of the present invention has a small Fno, small size, and high imaging performance by properly configuring the shape of each lens.

1 shows a photographing lens according to a first embodiment of the present invention.
FIG. 2 is an aberration diagram of the photographing lens shown in FIG. 1.
3 shows a photographing lens according to a second embodiment of the present invention.
4 is an aberration diagram of the photographing lens shown in FIG. 3.
5 shows a photographing lens according to a third embodiment of the present invention.
6 is an aberration diagram of the photographing lens shown in FIG. 5.
7 shows a photographing lens according to a fourth embodiment of the present invention.
8 is an aberration diagram of the photographing lens illustrated in FIG. 7.
9 shows a photographing lens according to a fifth embodiment of the present invention.
10 is an aberration diagram of the photographing lens shown in FIG. 9.
11 shows a photographing lens according to a sixth embodiment of the present invention.
12 is an aberration diagram of the photographing lens illustrated in FIG. 11.
13 shows a photographing lens according to a seventh embodiment of the present invention.
14 is an aberration diagram of the photographing lens illustrated in FIG. 13.
15 shows a photographing lens according to an eighth embodiment of the present invention.
16 is an aberration diagram of the photographing lens illustrated in FIG. 15.
17 schematically illustrates a photographing apparatus including a photographing lens according to an embodiment of the present invention.

Hereinafter, an imaging lens according to an embodiment of the present invention and an imaging device having the same will be described in detail with reference to the accompanying drawings.

1 shows a photographing lens according to an embodiment of the present invention. The photographing lens is a first lens (G1), a second lens (G2), a third lens (G3), a fourth lens (from the object side (O) to the image side (I) in order. G4), and a fifth lens G5.

An optical aperture stop SP may be disposed on the image side I of the first lens G1. For example, a sheet-shaped aperture stop SP may be disposed between the first lens G1 and the second lens G2. An optical block G may be provided between the fifth lens G5 and an image plane IP. The optical block G may include, for example, an optical filter or a phase plate. Alternatively, a flat optical member such as a cover glass or an infrared cut filter may be disposed as the optical block.

When a shooting lens is used as a shooting optical system such as an interchangeable lens camera, a surveillance camera, a video camera, or a digital still camera, the top surface (IP) corresponds to the shooting surface of a solid-state imaging element (photoelectric conversion element) such as a CCD sensor or CMOS sensor. Can be.

When a photographing lens is used in a camera for a silver salt film, the top surface (IP) may correspond to the film surface.

The first lens G1 may have positive refractive power. The first lens G1 has a convex surface on the object side O. In this example, the first lens G1 has both convex shapes having a convex surface on the image side.

By forming the object-side surface of the first lens in a convex shape, light incident on the photographing lens is condensed, and high imaging performance can be secured while miniaturizing the lens subsequent to the first lens G1.

The second lens G2 may have negative refractive power. The second lens G2 may have a convex surface on the image side. The second lens G2 may have a meniscus shape. Further, an inflection point is not provided on the image-side surface of the second lens. The inflection point represents a point where the refractive power (or curvature) changes from (+) to (-) or (-) to (+). By having the image side surface of the second lens having a convex surface that does not have an inflection point, it is possible to reduce the influence of assembly deviation occurring during lens manufacturing, for example, eccentricity, which greatly affects performance deterioration.

The third lens G3 may have positive refractive power. The third lens G3 may have a concave surface on the image side. The third lens G3 may have a meniscus shape. By forming the third lens G3 with a meniscus lens having a concave surface on the image side I, high imaging performance can be obtained.

The fourth lens G4 may have positive refractive power.

The fourth lens G4 may have a convex surface on the image side. The fourth lens G4 may have a meniscus shape. By forming the fourth lens G4 with a meniscus lens having a convex surface on the image side, it is possible to correct the aberration well to the periphery of the screen.

The fifth lens G5 may have positive refractive power.

The fifth lens G5 may have at least one inflection point at a position other than an intersection with the optical axis on the image side plane. The fifth lens G5 may have a concave shape on an image side near the optical axis. The fifth lens G5 is capable of satisfactorily correcting aberration in the periphery of the screen, and makes it easier to secure the incident angle characteristic of light rays incident on the image side.

Further, in this embodiment, when focusing from an infinite object distance to a short distance, focusing is performed by moving the entire first lens G1 to the fifth lens G5. Although focusing may be performed by moving some of the first to fifth lenses, it is preferable to move all of the first to fifth lenses to secure good performance at a short distance from the infinite object distance and to reduce the size.

The photographing lens according to the embodiment of the present invention may satisfy the following equation.

-3.0 <(r21 + r22) / (r21-r22) <-1.0 <Equation 1>

-10.0 <(r31 + r32) / (r31-r32) <-1.5 <Equation 2>

Here, r21 is the paraxial curvature radius of the object-side surface of the second lens, r22 is the paraxial curvature radius of the image-side surface of the second lens, r31 is the paraxial curvature radius of the object-side surface of the third lens, and r32 is the third It shows the paraxial curvature radius of the upper side of the lens.

Equation 1 limits the paraxial curvature radius of the object-side surface of the second lens G2 and the paraxial curvature radius of the image-side surface. Manufacturing error can be reduced by satisfying Expression 1.

When [(r21 + r22) / (r21-r22)] exceeds the upper limit of Equation 1, it is difficult to maintain a shape having a convex surface without the upper surface having an inflection point, and suppressing assembly variation occurring during manufacturing It becomes difficult.

In addition, the curvature of the object-side surface cannot maintain the negative refractive power of the second lens, and it may be difficult to secure performance around the screen.

When [(r21 + r22) / (r21-r22)] falls below the lower limit of Equation 1, the curvature of the upper side becomes larger and the divergence action becomes stronger, making it difficult to secure performance around the screen.

In addition, with respect to the curvature of the object-side surface, the negative refractive power of the second lens is weakened, and the surface causing divergence is reduced, so that the correction of the Petzval sum may be difficult.

Equation 2 limits the paraxial curvature radius of the object-side surface of the third lens and the paraxial curvature radius of the image-side surface. This may limit the shape of the third lens necessary for securing optical performance.

When [(r31 + r32) / (r31-r32)] exceeds the upper limit of Equation 2, the curvature of the object-side surface increases while the curvature of the upper surface decreases. As a result, the angle of light incident to the object-side surface of the third lens becomes large and correction of coma aberration may become difficult.

When [(r31 + r32) / (r31-r32)] falls below the lower limit of Equation 2, the curvature of the object-side surface decreases while the curvature of the upper surface increases. As a result, spherical aberration increases, and correction of aberration becomes difficult.

The photographing lens according to the embodiment of the present invention may satisfy the following equation.

-2.0 <(r21 + r22) / (r21-r22) <-1.0 <Equation 1a>

-8.0 <(r31 + r32) / (r31-r32) <-2.3 <Equation 2a>

Further, the fifth lens G5 may have both concave shapes near the optical axis.

By forming the fifth lens G5 in both concave shapes near the optical axis, negative refractive power can be dispersed, and the angle of incidence of the light incident on the upper surface can be secured not only on the upper surface of the fifth lens but also on the object side. Therefore, it is possible to secure high imaging performance in the periphery of the screen.

In addition, the first to fifth lenses may satisfy the following equation.

0.75 <f1 / f <1.4 <Equation 3>

-2.0 <f2 / f <-0.7 <Equation 4>

1.2 <f3 / f <3.8 <Equation 5>

0.4 <f4 / f <1.0 <Equation 6>

-0.85 <f5 / f <-0.3 <Equation 7>

Here, f1 is the focal length of the first lens G1, f2 is the focal length of the second lens G2, f3 is the focal length of the third lens G3, f4 is the focal length of the fourth lens G4, f5 represents the focal length of the fifth lens G5, and f represents the focal length of the entire photographing lens.

Equation 3 limits the ratio of the focal length of the first lens G1 and the focal length of the photographing lens. (f1 / f) When the refractive power of the first lens G1 becomes weaker than the upper limit of Equation 3, the diameter of the first lens G1 may be increased and enlarged. When (f1 / f) is below the lower limit of Expression 3, the refractive power of the first lens G1 becomes strong, it becomes difficult to correct the aberration, and it is difficult to obtain high performance.

Equation 4 limits the ratio of the focal length of the second lens G2 and the focal length of the photographing lens. When (f2 / f) exceeds the upper limit of Equation 4, the refractive power of the second lens G2 becomes strong, the divergence effect becomes too strong, and it may be difficult to correct aberrations around the screen.

If (f2 / f) is below the lower limit of Equation 4, the second lens G2 has a weak refractive power, a weak divergence effect, and it is difficult to increase the incidence angle of the off-axis light, making it difficult to downsize.

Equation 5 limits the ratio of the focal length of the third lens G3 and the focal length of the photographing lens. (f3 / f) exceeds the upper limit of Equation 5, the refractive power of the third lens G3 becomes weak, it is difficult to correct the off-axis light emitted from the second lens G2, and it is difficult to correct the aberration around the screen. It can be difficult.

If (f3 / f) is below the lower limit of Equation 5, the refractive power of the third lens G3 becomes strong, and the convergence action becomes too strong, so that the length of the entire optical system must be increased to secure the desired image height, so miniaturization is difficult.

Equation 6 limits the ratio of the focal length of the fourth lens G4 and the focal length of the photographing lens. When (f4 / f) exceeds the upper limit of Equation 6, the refractive power of the fourth lens G4 becomes weak, convergence of light rays in the fourth lens G4 cannot be sufficiently achieved, and the image formed by the fifth lens G5 It becomes difficult to secure the light incident angle characteristic of the.

When (f4 / f) is below the lower limit of Expression 6, the refractive power of the fourth lens G4 becomes strong, and the convergence action becomes too strong, making correction of astigmatism difficult.

Equation 7 limits the ratio of the focal length of the fifth lens G5 and the focal length of the photographing lens.

(f5 / f) exceeds the upper limit of Equation 7, the refractive power of the fifth lens G5 becomes strong, the divergence effect becomes too strong, and it may be difficult to secure the angle of incidence characteristic to the image surface.

If (f5 / f) is less than the lower limit of Equation 7, the refractive power of the fifth lens G5 is weakened, the divergence effect is weakened, and correction of astigmatism near the center of the screen may be difficult.

For example, the first to fifth lenses may satisfy the following equation.

0.80 <f1 / f <1.1 <Equation 3a>

-1.7 <f2 / f <-1.0 <Equation 4a>

1.5 <f3 / f <3.3 <Equation 5a>

0.5 <f4 / f <0.8 <Equation 6a>

-0.65 <f5 / f <-0.4 <Equation 7a>

Meanwhile, the first lens G1, the third lens G3, the fourth lens G4, and the fifth lens may be formed of the same material. For example, the first to fifth lenses may satisfy the following equation.

νd1345> 50.0 <Equation 8>

νd2 <25.0 <Equation 9>

Here, vd1345 represents Abbe's number with respect to the d line of the first lens G1, the third lens G3, the fourth lens G4, and the fifth lens G5, and vd2 is the second lens G2's The Abbe number for the d line is shown.

By forming the first lens G1, the third lens G3, the fourth lens G4, and the fifth lens G5 from the same material, for example, glass or resin, good chromatic aberration is corrected and high imaging performance is achieved. Can be secured.

For example, all of the first to fifth lenses are formed of plastic lenses, and the first lens G1, the third lens G3, the fourth lens G4, and the fifth lens G5 are the same plastic material. By forming as, the change in refractive index and shape due to temperature change can be offset from each other in each lens, thereby reducing performance degradation.

Equation 8 limits the Abbe number of the first lens G1, the third lens G3, the fourth lens G4, and the fifth lens G5.

When (νd1345) falls below the lower limit of Expression 8, correction of axial and magnification chromatic aberration becomes difficult.

Equation 9 limits the Abbe number of the second lens G2. When (νd2) exceeds the upper limit of Equation 9, the dispersion action of the second lens may not be sufficiently performed, and correction of axial chromatic aberration and magnification chromatic aberration may be difficult.

For example, the first to fifth lenses may satisfy the following equation.

νd1345> 53.0 <Equation 8a>

νd2 <23.0 <Equation 9a>

The photographing lens according to the embodiment of the present invention may satisfy the following equation.

D34t <D3t <Equation 10>

1.0 <(r41 + r42) / (r41-r42) <3.0 <Equation 11>

-0.8 <(r51 + r52) / (r51-r52) <3.0 <Equation 12>

Here, D34t is the optical axis air gap between the third lens G3 and the fourth lens G4, D3t is the optical axis thickness of the third lens G3, and r41 is the object side surface of the fourth lens G4. The paraxial radius of curvature, r42 the paraxial curvature radius of the image side of the fourth lens G4, r51 the paraxial curvature radius of the object side surface of the fifth lens G5, r52 the fifth lens G5 It shows the paraxial curvature radius of the upper side.

Equation 10 is an equation for miniaturization of the photographing lens, and limits the relationship between the optical axis air gap between the third lens G3 and the fourth lens G4 and the optical axis thickness of the third lens G3.

When (D34t) exceeds the upper limit of Equation 10, when the air gap on the optical axis of the third lens G3 and the fourth lens G4 is widened, the overall thickness on the optical axis is increased and miniaturization becomes difficult.

Equation 11 defines the paraxial curvature radius of the object-side surface of the fourth lens G4 and the paraxial curvature radius of the image-side surface.

When [(r41 + r42) / (r41-r42)] exceeds the upper limit of Equation 11, the curvature of the object-side surface increases, while the curvature of the upper surface becomes loose. As a result, the angle of light incident on the object-side surface of the fifth lens G5 becomes too small, and when the desired image height is secured, the entire length must be increased, so miniaturization is difficult.

If [(r41 + r42) / (r41-r42)] falls below the lower limit of Equation 11, the sign of curvature on the object-side surface may change to become convex, and the convergence action becomes so strong that the spherical aberration increases, Aberration correction becomes difficult.

Equation 12 is an expression that limits the paraxial curvature radius of the object-side surface of the fifth lens G5 and the paraxial curvature radius of the image-side surface.

When [(r51 + r52) / (r51-r52)] exceeds the upper limit of Equation 12, the fifth lens has a convex shape by changing the curvature sign of the object side surface, and disperses the negative refractive power of the fifth lens G5. Since it cannot, the load on the curvature of the upper side becomes large. Therefore, eccentricity sensitivity is increased, and as a result, performance deterioration due to variation in manufacturing may occur significantly.

When [(r51 + r52) / (r51-r52)] falls below the lower limit of Equation 12, the curvature of the object-side surface increases while the curvature of the upper surface decreases. As a result, it may be difficult to secure the light incident angle characteristic on the upper side.

For example, a photographing lens according to an embodiment of the present invention may satisfy the following equation.

1.15 <(r41 + r42) / (r41-r42) <2.5 <Equation 11a>

-0.5 <(r51 + r52) / (r51-r52) <1.5 <Equation 12a>

An embodiment of the present invention includes five lenses, and by properly configuring the shape and curvature of the lens, a Fno is small, small, and a photographing lens having high imaging performance can be implemented.

Hereinafter, the first to eighth embodiments of the present invention will be described.

Table 1 shows that each embodiment satisfies each conditional expression described above.

expression Embodiment 1 Example 2 Embodiment 3 Example 4 Example 5 Example 6 Example 7 Example 8 (1) -1.085 -1.986 -1.013 -1.015 -1.022 -1.020 -1.021 -1.019 (2) -5.392 -3.465 -6.056 -3.175 -8.000 -5.188 -6.181 -2.269 (3) 0.909 0.929 1.078 0.800 0.890 0.891 0.909 0.858 (4) -1.295 -1.560 -1.647 -0.903 -1.348 -1.213 -1.272 -1.180 (5) 2.246 2.013 2.295 1.500 3.259 2.064 2.491 1.536 (6) 0.616 0.547 0.609 0.739 0.617 0.580 0.794 0.655 (7) -0.484 -0.406 -0.503 -0.553 -0.504 -0.444 -0.650 -0.482 (11) 1.285 1.156 1.220 1.789 1.196 1.159 1.464 2.459 (12) 0.952 0.801 0.999 0.670 0.962 -0.534 1.500 1.000

In each embodiment, the surface number i indicates the order of the lens surface from the object side to the image side. ri is the radius of curvature of the i-th optical lens surface, di is the spacing between the i-th surface and the i + 1 surface, and ndi and νdi are the refractive indices of the i-th optical member with respect to the d line, respectively. Indicates.

The back focus (BF) is a value obtained by converting the distance from the final surface of the lens to the paraxial upper surface. The total length of the photographing lens is a value obtained by adding back focus (BF) to the distance from the object-side surface of the first lens to the final surface of the lens, that is, the image-side surface of the fifth lens.

The unit of length is mm.

In addition, K is a conic constant, A4, A6, A8, A10, and A12 are aspheric coefficients, and displacement in the direction of the optical axis at a height (h) from the optical axis is x based on the surface vertex. As follows.

<식 13>

<Equation 13>

Here, R is the radius of curvature. In addition, in the table below, "EZ" indicates "10 ^-Z ". f indicates focal length, Fno indicates F number, and ω indicates half angle of view.

(Example 1)

Table 2 shows the first embodiment. 1 shows a photographing lens of the first embodiment. 2 is an aberration diagram of the first embodiment.

Lens side r d nd υd Object plane ∞ ∞ One* 4.100 1.540 1.53113 55.75 2* -27.740 0.000 3 (aperture) ∞ 0.451 4* -6.112 0.600 1.65055 21.53 5 * -150 0.596 6 * 3.342 0.830 1.53113 55.75 7 * 4.864 0.825 8* -17.773 1.400 1.53113 55.75 9 * -2.220 0.578 10 * -80.323 0.600 1.53113 55.75 11 * 1.988 0.580 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top ∞

The following shows aspherical data of the first embodiment.

Front page K = 0 A4 = -1.453E-03 A6 = -6.60E-04 A8 = 1.490E-04 A10 = -4.930E-05 P. 2 K = 0 A4 = -3.742E-03 A6 = -6.400E-04 A8 = -4.103E-04 A10 = 5.289E-05 P. 4 K = 0 A4 = 5.932E-03 A6 = -8.339E-04 A8 = -5.829E-04 A10 = 1.183E-04 P. 5 K = 0 A4 = -2.380E-03 A6 = 1.889E-03 A8 = -5.921E-04 A10 = 6.452E-05 P. 6 K = 0 A4 = -1.770E-02 A6 = 8.480E-04 A8 = -1.080E-04 A10 = -4.340E-06 P. 7 K = 0 A4 = -2.625E-03 A6 = -2.520E-03 A8 = 3.209E-04 A10 = -3.026E-05 P. 8 K = 0 A4 = 8.875E-03 A6 = -1.569E-03 A8 = -1.122E-04 A10 = -5.645E-06 P. 9 K = -6.040E + 00 A4 = -8.283E-03 A6 = 3.113E-03 A8 = -7.163E-04 A10 = 4.476E-05 P. 10 K = 6.600E-05 A4 = -2.730E-02 A6 = 2.464E-03 A8 = -3.368E-04 A10 = 1.687E-05 P. 11 K = -6.731E + 00 A4 = -1.562E-02 A6 = 1.476E-03 A8 = -1.220E-04 A10 = 4.887E-06 A12 = -7.650E-08

The following shows various design data of the first embodiment.

Focal length 7.501 F number 1.87 Half angle of view (°) 33.29 Appeal 4.840 Lens length 9.500 BF 1.978

2 illustrates spherical aberration, astigmatic aberration, and distortion of the photographing lens according to the first embodiment of the present invention. The astigmatism shows the astigmatism of the top of the Meridional (?) And the astigmatism of the sagittal top (?). Hereinafter, such an aberration diagram is shown in each embodiment.

(Example 2)

Table 5 shows the second embodiment. Fig. 3 shows the photographing lens of the second embodiment. 4 is an aberration diagram of the second embodiment.

Lens side r d nd υd Object plane ∞ ∞ One* 3.944 1.340 1.53113 55.75 2* -57.261 0.000 3 (aperture) ∞ 0.628 4* -5.039 0.600 1.65055 21.53 5 * -15.262 0.785 6 * 3.954 0.880 1.53113 55.75 7 * 7.162 0.830 8* -28.546 1.390 1.53113 55.75 9 * -2.069 0.307 10 * -16.537 0.600 1.53113 55.75 11 * 1.827 0.588 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top ∞

The following shows aspherical data of the second embodiment.

Front page K = 0 A4 = -1.049E-03 A6 = -7.837E-04 A8 = 2.337E-04 A10 = -6.700E-05 P. 2 K = 0 A4 = -4.193E-03 A6 = -5.698E-05 A8 = -4.050E-04 A10 = 3.217E-05 P. 4 K = 0 A4 = 1.942E-03 A6 = 2.537E-04 A8 = -4.834E-04 A10 = 8.472E-05 P. 5 K = 0 A4 = -1.563E-03 A6 = 5.521E-04 A8 = -1.190E-04 A10 = 1.388E-05 P. 6 K = 0 A4 = -6.483E-03 A6 = -8.276E-04 A8 = 1.728E-04 A10 = -2.291E-05 P. 7 K = 0 A4 = 5.281E-03 A6 = -2.974E-03 A8 = 3.122E-04 A10 = -2.674E-05 P. 8 K = 0 A4 = 1.238E-02 A6 = -2.145E-03 A8 = -1.827E-04 A10 = -5.236E-05 P. 9 K = -8.418E + 00 A4 = -1.852E-03 A6 = 4.205E-03 A8 = -8.505E-04 A10 = 4.091E-05 P. 10 K = 1.288E-01 A4 = -1.715E-02 A6 = 1.599E-03 A8 = -1.710E-04 A10 = 8.109E-06 P. 11 K = -8.018E + 00 A4 = -1.319E-02 A6 = 1.234E-03 A8 = -1.202E-04 A10 = 6.662E-06 A12 = -1.466E-07

The following shows various design data of the second embodiment.

Focal length 7.505 F number 1.88 Half angle of view (°) 33.21 Appeal 4.840 Lens Length 9.448 BF 1.985

(Example 3)

Table 8 shows the third embodiment. Fig. 5 shows the photographing lens of the third embodiment. 6 is an aberration diagram of the third embodiment.

Lens side r d nd υd Object plane ∞ ∞ One* 3.948 1.380 1.53113 55.75 2* 43.458 0.000 3 (aperture) ∞ 0.624 4* -8.030 0.600 1.65055 21.53 5 * -1243 0.473 6 * 3.195 0.850 1.53113 55.75 7 * 4.459 0.830 8* -22.569 1.450 1.53113 55.75 9 * -2.239 0.584 10 * -6020 0.600 1.53113 55.75 11 * 2.004 0.599 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.210 Top ∞

The following is aspherical data of the third embodiment.

Front page K = 0 A4 = -1.140E-03 A6 = -7.118E-04 A8 = 1.553E-04 A10 = -4.575E-05 P. 2 K = 0 A4 = -3.511E-03 A6 = -5.492E-04 A8 = -4.195E-04 A10 = 4.670E-05 P. 4 K = 0 A4 = 5.297E-03 A6 = -1.027E-03 A8 = -5.919E-04 A10 = 1.173E-04 P. 5 K = 0 A4 = -2.201E-03 A6 = 1.701E-03 A8 = -5.891E-04 A10 = 6.948E-05 P. 6 K = 0 A4 = -1.781E-02 A6 = -8.162E-04 A8 = -9.089E-05 A10 = -4.138E-06 P. 7 K = 0 A4 = -2.229E-03 A6 = -2.592E-03 A8 = 3.439E-04 A10 = -2.957E-05 P. 8 K = 0 A4 = 9.519E-03 A6 = -1.379E-03 A8 = -1.232E-04 A10 = -1.887E-06 P. 9 K = -6.041E + 00 A4 = -7.977E-03 A6 = 3.356E-03 A8 = -7.410E-04 A10 = 4.621E-05 P. 10 K = 3.712E-08 A4 = -2.614E-02 A6 = 2.507E-03 A8 = -3.551E-04 A10 = 1.988E-05 P. 11 K = -6.420E + 00 A4 = -1.561E-02 A6 = 1.475E-03 A8 = -1.185E-04 A10 = 4.732E-06 A12 = -7.376E-08

The following shows various design data of the third embodiment.

Focal length 7.462 F number 1.87 Half angle of view (°) 33.41 Appeal 4.840 Lens length 9.500 BF 2.007

(Example 4)

Table 11 shows the fourth embodiment. Fig. 7 shows the photographing lens of the fourth embodiment. 8 is an aberration diagram of the fourth embodiment.

Lens side r d nd υd Object plane ∞ ∞ One* 4.044 1.420 1.53113 55.75 2* -13.351 0.000 3 (aperture) ∞ 0.475 4* -4.408 0.800 1.65055 21.53 5 * -600 0.383 6 * 3.177 0.900 1.53113 55.75 7 * 6.097 0.766 8* -8.082 1.330 1.53113 55.75 9 * -2.286 0.862 10 * -13.571 0.600 1.53113 55.75 11 * 2.680 0.465 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top ∞

The following is aspherical data of the fourth embodiment.

Front page K = 0 A4 = -1.264E-03 A6 = -7.988E-04 A8 = 2.421E-04 A10 = -7.125E-05 P. 2 K = 0 A4 = 7.279E-04 A6 = -2.766E-04 A8 = -5.515E-04 A10 = 5.349E-05 P. 4 K = 0 A4 = 1.948E-02 A6 = -3.047E-03 A8 = -2.295E-04 A10 = 8.354E-05 P. 5 K = 0 A4 = -4.074E-03 A6 = 2.949E-03 A8 = -8.972E-04 A10 = 9.648E-05 P. 6 K = 0 A4 = -2.699E-02 A6 = -1.905E-03 A8 = -4.917E-04 A10 = 2.488E-05 P. 7 K = 0 A4 = 2.184E-03 A6 = -4.146E-03 A8 = 4.164E-04 A10 = -3.940E-05 P. 8 K = 0 A4 = 9.694E-03 A6 = -1.003E-03 A8 = -2.442E-04 A10 = -4.098E-06 P. 9 K = -4.893E + 00 A4 = -1.335E-02 A6 = 3.652E-03 A8 = -7.289E-04 A10 = 4.310E-05 P. 10 K = -5.136E-02 A4 = -2.374E-02 A6 = 1.666E-03 A8 = -2.193E-04 A10 = 9.092E-07 P. 11 K = -8.965E + 00 A4 = -1.523E-02 A6 = 1.367E-03 A8 = -1.257E-04 A10 = 4.994E-06 A12 = -7.206E-08

The following shows various design data of the fourth embodiment.

Focal length 7.486 F number 1.87 Half angle of view (°) 33.33 Appeal 4.840 Lens length 9.500 BF 1.862

(Example 5)

Table 14 shows the fifth embodiment. Fig. 9 shows the photographing lens of the fifth embodiment. 10 is an aberration diagram of the fifth embodiment.

Lens side r d nd υd Object plane ∞ ∞ One* 4.070 1.550 1.53113 55.75 2* -24.314 0.000 3 (aperture) ∞ 0.444 4* -6.563 0.600 1.65055 21.53 5 * -600 0.620 6 * 3.654 0.790 1.53113 55.75 7 * 4.698 0.693 8* -25.676 1.470 1.53113 55.75 9 * -2.294 0.652 10 * -107.285 0.600 1.53113 55.75 11 * 2.057 0.581 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top ∞

The following is aspherical data of the fifth embodiment.

Front page K = 0 A4 = -1.366E-03 A6 = -6.384E-04 A8 = 1.608E-04 A10 = -5.272E-05 P. 2 K = 0 A4 = -3.655E-03 A6 = -5.715E-04 A8 = -4.131E-04 A10 = 5.144E-05 P. 4 K = 0 A4 = 4.826E-03 A6 = -8.496E-04 A8 = -5.772E-04 A10 = 1.218E-04 P. 5 K = 0 A4 = -1.689E-03 A6 = 1.579E-03 A8 = -5.909E-04 A10 = 7.184E-05 P. 6 K = 0 A4 = -1.816E-02 A6 = 6.623E-04 A8 = -7.566E-05 A10 = -7.125E-06 P. 7 K = 0 A4 = -4.732E-03 A6 = -2.556E-03 A8 = 3.243E-04 A10 = -3.192E-05 P. 8 K = 0 A4 = 9.497E-03 A6 = -1.639E-03 A8 = -1.331E-04 A10 = -1.866E-06 P. 9 K = -5.975E + 00 A4 = -8.912E-03 A6 = 3.280E-03 A8 = -7.437E-04 A10 = 4.725E-05 P. 10 K = 1.549E-04 A4 = -2.677E-02 A6 = 2.463E-03 A8 = -3.603E-04 A10 = 1.855E-05 P. 11 K = -6.569E + 00 A4 = -1.522E-02 A6 = 1.412E-03 A8 = -1.186E-04 A10 = 4.749E-06 A12 = -7.443E-08

The following are various design data of the fifth embodiment.

Focal length 7.489 F number 1.87 Half angle of view (°) 33.31 Appeal 4.840 Lens length 9.500 BF 1.979

(Example 6)

Table 17 shows the sixth example. Fig. 11 shows the photographing lens of the sixth embodiment. 12 is an aberration diagram of the sixth embodiment.

Lens side r d nd υd Object plane ∞ ∞ One* 4.171 1.560 1.53113 55.75 2* -21.305 0.000 3 (aperture) ∞ 0.452 4* -5.920 0.600 1.65055 21.53 5 * -600 0.587 6 * 3.176 0.830 1.53113 55.75 7 * 4.693 0.800 8* -29.682 1.480 1.53113 55.75 9 * -2.188 0.777 10 * -2.362 0.600 1.53113 55.75 11 * 7.787 0.313 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top ∞

The following is aspherical data of the sixth embodiment.

Front page K = 0 A4 = -1.375E-03 A6 = -6.011E-04 A8 = 1.447E-04 A10 = -4.706E-05 P. 2 K = 0 A4 = -2.173E-03 A6 = -5.832E-04 A8 = -4.442E-04 A10 = 5.117E-05 P. 4 K = 0 A4 = 7.991E-03 A6 = -9.641E-04 A8 = -6.472E-04 A10 = 1.141E-04 P. 5 K = 0 A4 = -2.810E-03 A6 = 2.123E-03 A8 = -6.564E-04 A10 = 6.648E-05 P. 6 K = 0 A4 = -1.865E-02 A6 = 9.913E-04 A8 = -1.235E-04 A10 = -1.869E-08 P. 7 K = 0 A4 = -3.072E-03 A6 = -2.242E-03 A8 = 2.795E-04 A10 = -2.850E-05 P. 8 K = 0 A4 = 4.275E-04 A6 = 3.206E-04 A8 = -1.842E-04 A10 = -1.070E-05 P. 9 K = -4.789E + 00 A4 = -1.432E-02 A6 = 4.780E-03 A8 = -7.789E-04 A10 = 4.104E-05 P. 10 K = -6.210E + 00 A4 = -1.045E-02 A6 = 6.585E-04 A8 = -2.012E-04 A10 = 2.408E-06 P. 11 K = 6.878E-01 A4 = -1.158E-02 A6 = 8.186E-04 A8 = -8.380E-05 A10 = 3.277E-06 A12 = -4.327E-08

The following are various design data of the sixth embodiment.

Focal length 7.498 F number 1.87 Half angle of view (°) 33.25 Appeal 4.840 Lens length 9.500 BF 1.711

(Example 7)

Table 20 shows the seventh example. Fig. 13 shows the photographing lens of the seventh embodiment. 14 is an aberration diagram of the seventh embodiment.

Lens side r d nd υd Object plane ∞ ∞ One* 4.018 1.470 1.53113 55.75 2* -33.061 0.000 3 (aperture) ∞ 0.449 4* -6.201 0.600 1.65055 21.53 5 * -600 0.522 6 * 3.342 0.760 1.53113 55.75 7 * 4.632 0.758 8* -14.237 1.350 1.53113 55.75 9 * -2.679 0.773 10 * 10.069 0.720 1.53113 55.75 11 * 2.014 0.597 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top ∞

The following is aspherical data of the seventh embodiment.

Front page K = 0 A4 = -1.272E-03 A6 = -7.019E-04 A8 = 1.878E-04 A10 = -5.717E-05 P. 2 K = 0 A4 = -3.252E-03 A6 = -4.515E-04 A8 = -4.744E-04 A10 = 5.558E-05 P. 4 K = 0 A4 = 7.435E-03 A6 = -1.082E-03 A8 = -5.694E-04 A10 = 1.180E-04 P. 5 K = 0 A4 = -2.464E-03 A6 = 1.917E-03 A8 = -6.218E-04 A10 = 6.967E-05 P. 6 K = 0 A4 = -2.085E-02 A6 = 4.616E-04 A8 = -1.069E-04 A10 = -3.290E-06 P. 7 K = 0 A4 = -2.841E-03 A6 = -3.601E-03 A8 = 4.934E-04 A10 = -4.589E-05 P. 8 K = 0 A4 = 9.911E-03 A6 = -2.785E-03 A8 = 1.435E-04 A10 = -2.111E-05 P. 9 K = -6.629E + 00 A4 = -1.420E-02 A6 = 3.086E-03 A8 = -5.942E-04 A10 = 4.071E-05 P. 10 K = 1.094E-02 A4 = -4.281E-02 A6 = 4.368E-03 A8 = -3.384E-04 A10 = 1.178E-05 P. 11 K = -5.183E + 00 A4 = -2.005E-02 A6 = 2.258E-03 A8 = -1.871E-04 A10 = 7.971E-06 A12 = -1.408E-07

The following are various design data of the seventh embodiment.

Focal length 7.493 F number 1.87 Half angle of view (°) 33.30 Appeal 4.840 Lens Length 9.500 BF 1.995

(Example 8)

Table 23 shows the eighth example. Fig. 15 shows the photographing lens of the eighth embodiment. 16 is an aberration diagram of the eighth embodiment.

Face number r d nd υd Object plane ∞ ∞ One* 4.033 1.470 1.53113 55.75 2* -20.091 0.000 3 (aperture) ∞ 0.470 4* -5.764 0.600 1.65055 21.53 5 * -600 0.574 6 * 3.949 0.890 1.53113 55.75 7 * 10.172 0.834 8* -4.247 1.280 1.53113 55.75 9 * -1.791 0.576 10 * -11755 0.700 1.53113 55.75 11 * 1.927 0.604 12 ∞ 0.300 1.51680 64.20 13 ∞ 1.200 Top ∞

The following is aspherical data of the eighth embodiment.

Front page K = 0 A4 = -1.814E-03 A6 = -6.805E-04 A8 = 1.399E-04 A10 = -6.015E-05 P. 2 K = 0 A4 = -2.928E-03 A6 = -6.194E-04 A8 = -4.257E-04 A10 = 4.884E-05 P. 4 K = 0 A4 = 7.982E-03 A6 = -6.497E-04 A8 = -5.815E-04 A10 = 1.134E-04 P. 5 K = 0 A4 = -3.242E-03 A6 = 1.933E-03 A8 = -5.643E-04 A10 = 5.448E-05 P. 6 K = 0 A4 = -1.864E-02 A6 = 4.787E-04 A8 = -1.642E-04 A10 = -1.401E-05 P. 7 K = 0 A4 = 2.786E-04 A6 = -2.883E-03 A8 = 2.854E-04 A10 = -3.719E-05 P. 8 K = 0 A4 = 1.222E-02 A6 = -1.449E-03 A8 = -1.396E-04 A10 = -1.283E-06 P. 9 K = -3.817E + 00 A4 = -1.194E-02 A6 = 3.362E-03 A8 = -7.116E-04 A10 = 4.989E-05 P. 10 K = -5.674E-09 A4 = -2.367E-02 A6 = 2.369E-03 A8 = -3.634E-04 A10 = 2.046E-05 P. 11 K = -6.846E + 00 A4 = -1.380E-02 A6 = 1.253E-03 A8 = -1.115E-04 A10 = 5.128E-06 A12 = -9.891E-08

The following are various design data of the eighth embodiment.

Focal length 7.502 F number 1.88 Half angle of view (°) 33.24 Appeal 4.840 Lens Length 9.498 BF 2.002

As described above, the photographing lens according to the embodiment of the present invention includes five lenses, and by properly configuring the shape and curvature of each lens, Fno is small, small, and has high imaging performance. The photographing lens according to the embodiment of the present invention may be applied to, for example, a video camera, a digital still camera, a mobile phone with a camera, or an information portable terminal.

17 shows an example of a photographing apparatus having a photographing lens according to an embodiment of the present invention. The photographing apparatus includes a photographing lens 100 and a photographing element 112 that receives an optical image formed by the photographing lens 100 and converts it into an electric image signal. The photographing lens 100 is the same as described with reference to FIGS. 1 to 16. The photographing device has a housing 110 that can be detached from the photographing lens 100 as an interchangeable lens, and includes the photographing element in the housing 110. The photographing apparatus may include a recording means 113 in which information corresponding to an object photoelectrically converted from the photographing element 112 is recorded, and a view finder 114 for observing the subject image. Then, a display unit 115 on which the subject image is displayed may be provided. Here, although an example in which the viewfinder 114 and the display unit 115 are separately provided is shown, only the display unit may be provided without a viewfinder. The photographing apparatus illustrated in FIG. 17 is only an example, and is not limited thereto, and is applicable to cameras, mobile optical devices, and the like. By applying the photographing lens according to the embodiment of the present invention to a photographing apparatus such as a digital camera, a photographing apparatus that is compact, bright, and capable of photographing with high performance can be implemented.

The above-described embodiments are merely exemplary, and various modifications and equivalent other embodiments are possible from those skilled in the art. Therefore, the true technical protection scope according to the embodiment of the present invention should be determined by the technical spirit of the invention described in the following claims.

G1 first lens, G2 ... second lens,
G3 ... 3rd lens, G4 ... 4th lens,
G5 ... 5th lens, SP ... aperture
IP ... imaging plane △ plane ... Meridional upper plane,
△ S ... sagittal top, ω ... half angle,
Fno ... F number

Claims (17)

It is arranged in order from the object side to the top side,
A first lens having a convex surface on the object side and having a positive refractive power;
A second lens having negative refractive power having a convex surface on the image side;
A third lens having a meniscus shape having a concave surface on the image side and having a positive refractive power;
A fourth lens having a meniscus shape having a convex surface on the image side and having a positive refractive power; And
A fifth lens having a concave surface on the image side near the optical axis and having negative refractive power.
<Expression>
-3.0 <(r21 + r22) / (r21-r22) <-1.0
-10.0 <(r31 + r32) / (r31-r32) <-1.5
D34t <D3t
Here, r21 is the paraxial curvature radius of the object-side surface of the second lens, r22 is the paraxial curvature radius of the image-side surface of the second lens, r31 is the paraxial curvature radius of the object-side surface of the third lens, r32 is the second 3 is the paraxial curvature radius of the image side of the lens, D34t represents the air gap on the optical axis of the third lens and the fourth lens, and D3t represents the optical axis thickness of the third lens. According to claim 1,
The first lens and the second lens is a shooting lens that satisfies the following equation.
<Expression>
0.75 <f1 / f <1.4
-2.0 <f2 / f <-0.7
Here, f is a focal length of the photographing lens, f1 is a focal length of the first lens, and f2 is a focal length of the second lens. The method according to claim 1 or 2,
The third lens and the fourth lens are shooting lenses that satisfy the following equation.
<Expression>
1.2 <f3 / f <3.8
0.4 <f4 / f <1.0
Here, f represents a focal length of the photographing lens, f3 represents a focal length of the third lens, and f4 represents a focal length of the fourth lens. The method according to claim 1 or 2,
The fifth lens is a shooting lens that satisfies the following equation.
<Expression>
-0.85 <f5 / f <-0.3
Here, f denotes a focal length of the photographing lens, and f5 denotes a focal length of the fifth lens. The method of claim 4,
The fifth lens is a photographing lens having a positive concave shape near the optical axis. The method according to claim 1 or 2,
An imaging lens in which the image side of the second lens has no inflection point. The method according to claim 1 or 2,
An imaging lens in which the image side surface of the fifth lens has at least one inflection point in addition to an intersection point with an optical axis. The method according to claim 1 or 2,
The first lens, the third lens, the fourth lens and the fifth lens are shooting lenses formed of the same material. The method according to claim 1 or 2,
A shooting lens that satisfies the following equation.
<Expression>
νd1345> 50.0
Here, νd1345 denotes the Abbe number for the d-line of the first lens, the third lens, the fourth lens, and the fifth lens. The method according to claim 1 or 2,
A shooting lens that satisfies the following equation.
<Expression>
νd2 <25.0
Here, νd2 represents Abbe's number with respect to the d-line of the second lens. delete The method according to claim 1 or 2,
A shooting lens that satisfies the following equation.
<Expression>
1.0 <(r41 + r42) / (r41-r42) <3.0
Here, r41 represents the paraxial curvature radius of the object-side surface of the fourth lens, and r42 represents the paraxial curvature radius of the image-surface side of the fourth lens. The method according to claim 1 or 2,
A shooting lens that satisfies the following equation.
<Expression>
-0.8 <(r51 + r52) / (r51-r52) <3.0
Here, r51 represents the paraxial curvature radius of the object-side surface of the fifth lens, and r52 represents the paraxial curvature radius of the image-side surface of the fifth lens. The photographing lens according to claim 1 or 2; And
An imaging device that receives an optical image formed by the imaging lens and converts it into an electrical image signal. The method of claim 14,
The third lens and the fourth lens is a photographing device that satisfies the following equation.
<Expression>
1.2 <f3 / f <3.8
0.4 <f4 / f <1.0
Here, f represents a focal length of the photographing lens, f3 represents a focal length of the third lens, and f4 represents a focal length of the fourth lens. The method of claim 14,
The fifth lens is a photographing device that satisfies the following equation.
<Expression>
-0.85 <f5 / f <-0.3
Here, f denotes a focal length of the photographing lens, and f5 denotes a focal length of the fifth lens. The method of claim 16,
The fifth lens is a photographing device having a concave shape in the vicinity of the optical axis.

Images